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Financial Derivative Instruments (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Interest Rate Swap June 28 2021
Derivative [Line Items]
Notional Amount	$ 30,000,000
Fixed Rate Paid	0.94%
Fair Value	$ 1,552,000	$ 1,154,000	$ 934,000
Interest Rate Swap June 27 2021
Derivative [Line Items]
Notional Amount	$ 20,000,000
Fixed Rate Paid	0.893%
Fair Value	$ 1,059,000	801,000	658,000
Interest Rate Swap December 5 2019
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.466%
Fair Value	$ 59,000	0	0
Interest Rate Swap June 5 2020
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.547%
Fair Value	$ 94,000	0	0
Interest Rate Swap December 5 2020
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.603%
Fair Value	$ 124,000	0	0
Interest Rate Swap
Derivative [Line Items]
Notional Amount	125,000,000
Fair Value	$ 2,888,000	$ 1,955,000	$ 1,592,000

X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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